package com.atguigu.gulimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.to.es.SkuEsModel;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.search.config.GulimallElasticSerachConfig;
import com.atguigu.gulimall.search.constant.EsConstant;
import com.atguigu.gulimall.search.feign.ProductFeignService;
import com.atguigu.gulimall.search.service.MallSerachService;
import com.atguigu.gulimall.search.vo.AttrResponseVo;
import com.atguigu.gulimall.search.vo.BrandVo;
import com.atguigu.gulimall.search.vo.SearchParam;
import com.atguigu.gulimall.search.vo.SearchResult;
import com.mysql.cj.QueryBindings;
import org.apache.commons.lang.StringUtils;
import org.apache.lucene.queryparser.xml.builders.BooleanQueryBuilder;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.AutoConfigurationPackage;
import org.springframework.stereotype.Service;
import org.w3c.dom.Attr;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class MallSerachServiceImpl implements MallSerachService {

    @Autowired
    private RestHighLevelClient client;

    @Autowired
    private ProductFeignService productFeignService;

    @Override
    public SearchResult search(SearchParam searchParam) {

        SearchResult result = null;

        // 准备检索请求
        SearchRequest searchResult = buildSearchRequest(searchParam);

        try {
            // 执行检索请求
            SearchResponse searchResponse = client.search(searchResult, GulimallElasticSerachConfig.COMMON_OPTIONS);

            // 分析相应数据 封装成页面需要的格式
            result = buildSearchResult(searchResponse, searchParam);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 构建检索结果
     * @param searchResponse
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse searchResponse, SearchParam searchParam) {

        SearchResult result = new SearchResult();

        SearchHits hits = searchResponse.getHits();

        List<SkuEsModel> esModels = new ArrayList<>();
        if(hits.getHits() != null && hits.getHits().length > 0){
            for (SearchHit hit : hits.getHits()) {

                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);

                // 设置高亮
                if(! StringUtils.isEmpty(searchParam.getKeyword())){
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String s = skuTitle.getFragments()[0].string();

                    esModel.setSkuTitle(s);
                }

                esModels.add(esModel);
            }
        }
        result.setProducts(esModels);

        // 属性信息

        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attr_agg = searchResponse.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");

        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {

            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            // 等到属性的ID
            long attrId = bucket.getKeyAsNumber().longValue();
            // 等到属性的名字
            String attrName = ((ParsedStringTerms)bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
            // 等到属性的值
            List<String> attrValues = ((ParsedStringTerms)bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item-> {
                String keyAsString = item.getKeyAsString();
                return keyAsString;
            }).collect(Collectors.toList());

            attrVo.setAttrId(attrId);
            attrVo.setAttrName(attrName);
            attrVo.setAttrValue(attrValues);

            attrVos.add(attrVo);
        }
        
        result.setAttrs(attrVos);

        // 品牌信息
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brand_agg = searchResponse.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {

            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            // 品牌ID
            long brandId = bucket.getKeyAsNumber().longValue();
            // 品牌名字
            String brandName = ((ParsedStringTerms)bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            // 品牌图片
            String brandImg = ((ParsedStringTerms)bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();

            brandVo.setBrandId(brandId);
            brandVo.setBrandImg(brandName);
            brandVo.setBrandImg(brandImg);

            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);

        // 分类信息
        ParsedLongTerms catalog_agg = searchResponse.getAggregations().get("catalog_agg");
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();

        for (Terms.Bucket bucket : buckets) {

            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            //  得到分类ID
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));

            // 得到分类名
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);

            catalogVos.add(catalogVo);
        }

        result.setCatalogs(catalogVos);

        // 分页信息


        result.setPageNum(searchParam.getPageNum());
        long total = hits.getTotalHits().value;
        result.setTotal(total);

        int totalPages = (int)total%EsConstant.PRODUCT_PAGESIZE == 0 ? (int)total/EsConstant.PRODUCT_PAGESIZE : (int)total/EsConstant.PRODUCT_PAGESIZE + 1;
        result.setTotalPages(totalPages);

        List<Integer> pageNavs = new ArrayList<>();
        for (int i = 1; i <= totalPages; i++) {
            pageNavs.add(i);
        }

        result.setPageNavs(pageNavs);

        // 构建面包屑导航功能
        if(searchParam.getAttrs() != null && searchParam.getAttrs().size() > 0){
            List<SearchResult.NavVo> collect = searchParam.getAttrs().stream().map(attr->{
                SearchResult.NavVo navVo = new SearchResult.NavVo();

                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                R r = productFeignService.attrInfo(Long.parseLong(s[0]));
                result.getAttrIds().add(Long.parseLong(s[0]));
                if(r.getCode() == 0){
                    AttrResponseVo data = r.getData("attr",new TypeReference<AttrResponseVo>(){});
                    navVo.setNavName(data.getAttrName());
                }else{
                    navVo.setNavName(s[0]);
                }

                // 取消了面包屑以后将当前url里的值置空
                String replace = replaceQueryString(searchParam, attr, "attrs");
                navVo.setLink("http://search.gulimall.com/list.html?"+replace);
                return navVo;

            }).collect(Collectors.toList());

            result.setNavs(collect);
        }

        // 品牌
        if(searchParam.getBrandId() != null && searchParam.getBrandId().size() > 0){
            List<SearchResult.NavVo> navs = result.getNavs();
            SearchResult.NavVo navVo = new SearchResult.NavVo();
            navVo.setNavName("品牌");

            R r = productFeignService.brandInfos(searchParam.getBrandId());
            if(r.getCode() == 0){
                List<BrandVo> brandVos1 = r.getData(new TypeReference<List<BrandVo>>(){});
                StringBuffer buffer = new StringBuffer();
                String replace = "";
                for (BrandVo brandVo : brandVos1) {
                    buffer.append(brandVo.getBrandName()+";");
                    replace = replaceQueryString(searchParam, brandVo.getBrandId()+"", "brandId");
                }

                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.gulimall.com/list.html?"+replace);
            }

            navs.add(navVo);

            //todo 分类不需要导航删除

            result.setNavs(navs);
        }

        return result;
    }

    private String replaceQueryString(SearchParam searchParam, String val, String key) {
        String encode = null;
        try {
            encode = URLEncoder.encode(val, "UTF-8");
            encode = encode.replace("+","%20"); // 浏览器对空格的编码和java不一样
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return searchParam.get_queryString().replace("&"+key+"=" + encode, "");
    }

    /**
     * 创建检所请求
     * @return
     */
    private SearchRequest buildSearchRequest(SearchParam searchParam) {

        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();


        /**
         * 模糊匹配，过滤（按照属性，分类，品牌，价格区间，库存）
         */
        // 1.构建boolquery
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        // 1.1must模糊匹配
        if(!StringUtils.isEmpty(searchParam.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitle", searchParam.getKeyword()));
        }
        // 1.2 构建bool - filter 按照三级分类ID过滤
        if(searchParam.getCatalog3Id() != null){
            boolQuery.filter(QueryBuilders.termQuery("catalogId", searchParam.getCatalog3Id()));
        }
        // 1.2 构建bool - filter 按照品牌ID过滤
        if(searchParam.getBrandId() != null){
            boolQuery.filter(QueryBuilders.termsQuery("brandId", searchParam.getBrandId()));
        }

        // 1.2 构建bool - filter 按照所有的指定属性过滤
        if(searchParam.getAttrs() != null && searchParam.getAttrs().size() > 0){


            for (String attr : searchParam.getAttrs()) {
                // attr=1_5寸:8寸
                BoolQueryBuilder nesyedBoolQuery = QueryBuilders.boolQuery();
                String[] s = attr.split("_");
                String attId = s[0];    //属性ID
                String[] attrValues = s[1].split(":");  // 属性的值
                nesyedBoolQuery.must(QueryBuilders.termQuery("attrs.attrId",attId));
                nesyedBoolQuery.must(QueryBuilders.termsQuery("attrs.attrValue",attrValues));

                // 每一个都必须得生成nestedQuery
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nesyedBoolQuery, ScoreMode.None);

                boolQuery.filter(nestedQuery);
            }

        }

        // 1.2 构建bool - filter 按照是否有库存过滤
        if(searchParam.getHasStock() != null){
            boolQuery.filter(QueryBuilders.termQuery("hasStock", searchParam.getHasStock()==1));
        }

        // 1.2 构建bool - filter 按照价格区间过滤
        if(! StringUtils.isEmpty(searchParam.getSkuPrice())){
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");

            String[] s = searchParam.getSkuPrice().split("_");
            if(s.length == 2){
                rangeQuery.gte(s[0]).lte(s[1]);
            }else if(s.length == 1){
                if(searchParam.getSkuPrice().startsWith("_")){
                    rangeQuery.lte(s[0]);
                }
                if(searchParam.getSkuPrice().endsWith("_")){
                    rangeQuery.gte(s[0]);
                }
            }

            boolQuery.filter((rangeQuery));
        }
        // 把所有查询条件都进行封装
        sourceBuilder.query(boolQuery);

        /**
         * 排序、分页、高亮
         */
        // 2.1排序
        if(! StringUtils.isEmpty(searchParam.getSort())){
            String sort = searchParam.getSort();
            String[] s = sort.split("_");
            SortOrder order = s[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC;
            sourceBuilder.sort(s[0], order);

        }
        // 2.2 分页
        sourceBuilder.from((searchParam.getPageNum() - 1) * EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);

        // 2.2 高亮
        if(! StringUtils.isEmpty(searchParam.getKeyword())){
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder);
        }



        /**
         * 聚合分析
         */
        // 3.1 品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);
        // 品牌聚合的子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));

        sourceBuilder.aggregation(brand_agg);

        // 3.2 分类聚合
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(50);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        sourceBuilder.aggregation(catalog_agg);

        // 3.3 属性聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg","attrs");

        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        // 属性名
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName")).size(1);
        // 属性值
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue")).size(50);



        attr_agg.subAggregation(attr_id_agg);
        sourceBuilder.aggregation(attr_agg);


        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);

        String s = sourceBuilder.toString();
        System.out.println(s);


        return searchRequest;
    }
}
